Fix browser.rb not navigating to base URL
If the root_module does not respond to base_url, assume that the URI host is Chemlab.base_url
Example of this failing:
https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/4931552
If the root_module does not respond to base_url, assume that the URI host is Chemlab.base_url
Example of this failing:
https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/4931552